Impulse: A fire hose is turned on the door of a burning building in order to knock the door down. This requires a force of 1000 N. If the hose delivers 40 kg of water per second, what is the minimum velocity of the stream needed to knock down the door, assuming the water doesn't bounce back?
A. 15 m/s
B. 20 m/s
C. 25 m/s
D. 30 m/s
Answer: C
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Fill in the blank(s) with correct word
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